package day05;

public class ArrayDemo3 {
    public static void main(String[] args) {
        int[] arr=new int[3];
        System.out.println("数组的长度："+arr.length);
        System.out.println("数组第1个元素的值："+arr[0]);
        arr[0]=100;
        arr[1]=200;
        arr[2]=300;
        System.out.println(arr[2]);
        System.out.println(arr[arr.length-1]);
    }
}
